[llvm] [AMDGPU] Introduce custom MIR formatting for s_wait_alu (PR #176316)

[via llvm-commits]

================
@@ -0,0 +1,70 @@
+# NOTE: Assertions have been autogenerated by utils/update_mir_test_checks.py UTC_ARGS: --version 6
+# RUN: llc -mtriple=amdgcn -mcpu=gfx1200 -verify-machineinstrs -run-pass=none %s -o - | FileCheck %s
----------------
vporpo wrote:

Done

https://github.com/llvm/llvm-project/pull/176316